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Insulated glazing
Insulating glass (IG) consists of two or more glass window panes separated by a space to reduce heat transfer across a part of the building envelope. A window with insulating glass is commonly known as double glazing or a double-paned window, triple glazing or a triple-paned window, or quadruple glazing or a quadruple-paned window, depending upon how many panes of glass are used in its construction.
Insulating glass units (IGUs) are typically manufactured with glass in thicknesses from 3 to 10 mm (1⁄8 to 3⁄8 in). Thicker glass is used in special applications. Laminated or tempered glass may also be used as part of the construction. Most units are produced with the same thickness of glass on both panes but special applications such as acoustic attenuation or security may require different thicknesses of glass to be incorporated in a unit.
The space in between the panes provides the bulk of the insulation effect. It can be filled with air, but argon is often used as it gives far superior insulation, and sometimes others gases or a vacuum are employed.
Possibly the earliest use of double glazing was in Siberia, where it was observed by Henry Seebohm in 1877 as an established necessity in the Yeniseysk area where the bitterly cold winter temperatures regularly fall below -50 °C, indicating how the concept may have started:
One of the peculiarities of this part of the country is that it is a land of dear glass. You rarely see a window with square panes. In the houses of some of the poorer peasants it is not an uncommon thing to find one entirely composed of broken pieces of glass of all sizes and shapes, fitted together like a puzzle, and carefully sewn into a framework of birch bark which has been elaborately cut to fit each piece. Sometimes glass is dispensed with altogether, and pieces of semi-transparent fish-skin are stitched together and stretched across the window-frame.
In winter double windows are absolutely necessary to prevent the inmates of the houses from being frozen to death. The outside windows project about six inches in front of the inside ones. If the inside window reveals the poverty of the inhabitants, the outside window seemingly displays his extravagance. To all appearances it is composed of one solid pane of plate-glass nearly three inches thick. On closer examination this extravagant sheet of plate-glass turns out to be a slab of ice carefully frozen into the framework with a mixture of snow and water in place of putty.
Fitting a second pane of glass to improve insulation began in Scotland, Germany, and Switzerland in the 1870s.
Insulating glass is an evolution from older technologies known as double-hung windows and storm windows. Traditional double-hung windows used a single pane of glass to separate the interior and exterior spaces.
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Insulated glazing
Insulating glass (IG) consists of two or more glass window panes separated by a space to reduce heat transfer across a part of the building envelope. A window with insulating glass is commonly known as double glazing or a double-paned window, triple glazing or a triple-paned window, or quadruple glazing or a quadruple-paned window, depending upon how many panes of glass are used in its construction.
Insulating glass units (IGUs) are typically manufactured with glass in thicknesses from 3 to 10 mm (1⁄8 to 3⁄8 in). Thicker glass is used in special applications. Laminated or tempered glass may also be used as part of the construction. Most units are produced with the same thickness of glass on both panes but special applications such as acoustic attenuation or security may require different thicknesses of glass to be incorporated in a unit.
The space in between the panes provides the bulk of the insulation effect. It can be filled with air, but argon is often used as it gives far superior insulation, and sometimes others gases or a vacuum are employed.
Possibly the earliest use of double glazing was in Siberia, where it was observed by Henry Seebohm in 1877 as an established necessity in the Yeniseysk area where the bitterly cold winter temperatures regularly fall below -50 °C, indicating how the concept may have started:
One of the peculiarities of this part of the country is that it is a land of dear glass. You rarely see a window with square panes. In the houses of some of the poorer peasants it is not an uncommon thing to find one entirely composed of broken pieces of glass of all sizes and shapes, fitted together like a puzzle, and carefully sewn into a framework of birch bark which has been elaborately cut to fit each piece. Sometimes glass is dispensed with altogether, and pieces of semi-transparent fish-skin are stitched together and stretched across the window-frame.
In winter double windows are absolutely necessary to prevent the inmates of the houses from being frozen to death. The outside windows project about six inches in front of the inside ones. If the inside window reveals the poverty of the inhabitants, the outside window seemingly displays his extravagance. To all appearances it is composed of one solid pane of plate-glass nearly three inches thick. On closer examination this extravagant sheet of plate-glass turns out to be a slab of ice carefully frozen into the framework with a mixture of snow and water in place of putty.
Fitting a second pane of glass to improve insulation began in Scotland, Germany, and Switzerland in the 1870s.
Insulating glass is an evolution from older technologies known as double-hung windows and storm windows. Traditional double-hung windows used a single pane of glass to separate the interior and exterior spaces.